从ubuntu启动脚本学习

首先我们以ubuntu下的redis服务器启动脚本说起。

#!/bin/sh
###BEGININITINFO
#Provides:redis-server
#required-Start:$syslog$remote_fs
#required-Stop:$syslog$remote_fs
#Should-Start:$local_fs
#Should-Stop:$local_fs
#Default-Start:2345
#Default-Stop:016
#Short-Description:redis-server-Persistentkey-valuedb
#Description:redis-server-Persistentkey-valuedb
###ENDINITINFO
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/bin/redis-server
DAEMON_ARGS=/etc/redis/redis.conf
NAME=redis-server
DESC=redis-server
RUNDIR=/var/run/redis
PIDFILE=$RUNDIR/redis-server.pid
test-x$DAEMON||exit0
if[-r/etc/default/$NAME]
then
./etc/default/$NAME
fi
./lib/lsb/init-functions
set-e
case"$1"in
start)
echo-n"Starting$DESC:"
mkdir-p$RUNDIR
touch$PIDFILE
chownredis:redis$RUNDIR$PIDFILE
chmod755$RUNDIR
if[-n"$ULIMIT"]
then
ulimit-n$ULIMIT
fi
ifstart-stop-daemon--start--quiet--umask007--pidfile$PIDFILE--chuidredis:redis--exec$DAEMON--$DAEMON_ARGS
then
echo"$NAME."
else
echo"Failed"
fi
;;
stop)
echo-n"Stopping$DESC:"
ifstart-stop-daemon--stop--retryforever/TERM/1--quiet--oknodo--pidfile$PIDFILE--exec$DAEMON
then
echo"$NAME."
else
echo"Failed"
fi
rm-f$PIDFILE
sleep1
;;
restart|force-reload)
${0}stop
${0}start
;;
status)
echo-n"$DESCis"
ifstart-stop-daemon--stop--quiet--signal0--name${NAME}--pidfile${PIDFILE}
then
echo"running"
else
echo"notrunning"
exit1
fi
;;
*)
echo"Usage:/etc/init.d/$NAME{start|stop|restart|force-reload|status}">&2
exit1
;;
esac
exit0

ubuntu下的MysqL服务启动脚本

#!/bin/bash
#
###BEGININITINFO
#Provides:MysqL
#required-Start:$remote_fs$syslog
#required-Stop:$remote_fs$syslog
#Should-Start:$network$time
#Should-Stop:$network$time
#Default-Start:2345
#Default-Stop:016
#Short-Description:StartandstoptheMysqLdatabaseserverdaemon
#Description:ControlsthemainMysqLdatabaseserverdaemon"MysqLd"
#anditswrapperscript"MysqLd_safe".
###ENDINITINFO
#
set-e
set-u
${DEBIAN_SCRIPT_DEBUG:+set-v-x}
test-x/usr/bin/MysqLd_safe||exit0
./lib/lsb/init-functions
SELF=$(cd$(dirname$0);pwd-P)/$(basename$0)
CONF=/etc/MysqL/my.cnf
MYADMIN="/usr/bin/MysqLadmin--defaults-file=/etc/MysqL/debian.cnf"
#prioritycanbeoverridenand"-s"addsoutputtostderr
ERR_LOGGER="logger-pdaemon.err-t/etc/init.d/MysqL-i"
#Safeguard(relativepaths,coredumps..)
cd/
umask077
#MysqLadminlikestoread/root/.my.cnf.ThisisusuallynotwhatIwant
#asmanyadminse.g.onlystoreapasswordwithoutausernamethereand
#sobreakmyscripts.
exportHOME=/etc/MysqL/
##FetchaparticularoptionfromMysqL'sinvocation.
#
#Usage:voidMysqLd_get_paramoption
MysqLd_get_param(){
/usr/sbin/MysqLd--print-defaults\
|tr"""\n"\
|grep--"--$1"\
|tail-n1\
|cut-d=-f2
}
##DosomesanitychecksbeforeeventryingtostartMysqLd.
sanity_checks(){
#checkforconfigfile
if[!-r/etc/MysqL/my.cnf];then
log_warning_msg"$0:WARNING:/etc/MysqL/my.cnfcannotberead.SeeREADME.Debian.gz"
echo"WARNING:/etc/MysqL/my.cnfcannotberead.SeeREADME.Debian.gz"|$ERR_LOGGER
fi
#checkfordiskspaceshortage
datadir=`MysqLd_get_paramdatadir`
ifLC_ALL=CBLOCKSIZE=df--portability$datadir/.|tail-n1|awk'{exit($4>4096)}';then
log_failure_msg"$0:ERROR:Thepartitionwith$datadiristoofull!"
echo"ERROR:Thepartitionwith$datadiristoofull!"|$ERR_LOGGER
exit1
fi
}
##Checksifthereisaserverrunningandifsoifitisaccessible.
#
#check_aliveinsistsonapingableserver
#check_deadalsofailsifthereisalostMysqLdintheprocesslist
#
#Usage:booleanMysqLd_status[check_alive|check_dead][warn|Nowarn]
MysqLd_status(){
ping_output=`$MYADMINping2>&1`;ping_alive=$((!$?))
ps_alive=0
pidfile=`MysqLd_get_parampid-file`
if[-f"$pidfile"]&&ps`cat$pidfile`>/dev/null2>&1;thenps_alive=1;fi
if["$1"="check_alive"-a$ping_alive=1]||
["$1"="check_dead"-a$ping_alive=0-a$ps_alive=0];then
return0#EXIT_SUCCESS
else
if["$2"="warn"];then
echo-e"$ps_aliveprocessesaliveand'$MYADMINping'resultedin\n$ping_output\n"|$ERR_LOGGER-pdaemon.debug
fi
return1#EXIT_FAILURE
fi
}
#
#main()
#
case"${1:-''}"in
'start')
sanity_checks;
#Startdaemon
log_daemon_msg"StartingMysqLdatabaseserver""MysqLd"
ifMysqLd_statuscheck_aliveNowarn;then
log_progress_msg"alreadyrunning"
log_end_msg0
else
#Couldberemovedduringboot
test-e/var/run/MysqLd||install-m755-oMysqL-groot-d/var/run/MysqLd
#StartMysqL!
/usr/bin/MysqLd_safe>/dev/null2>&1&
#6swasreportedin#352070tobetoofewwhenusingndbcluster
#14swasreportedin#736452tobetoofewwithlargeinstalls
foriin$(seq130);do
sleep1
ifMysqLd_statuscheck_aliveNowarn;thenbreak;fi
log_progress_msg"."
done
ifMysqLd_statuscheck_alivewarn;then
log_end_msg0
#NowstartMysqLcheckorwhatevertheadminwants.
output=$(/etc/MysqL/debian-start)
[-n"$output"]&&log_action_msg"$output"
else
log_end_msg1
log_failure_msg"Pleasetakealookatthesyslog"
fi
fi
;;
'stop')
#*AsapasswordlessMysqLadmin(e.g.via~/.my.cnf)mustbepossible
#atleastforcron,wecanrelyonithere,too.(althoughwehave
#tospecifyitexplicitase.g.sudoenvironmentspointstothenormal
#usershomeandnot/root)
log_daemon_msg"StoppingMysqLdatabaseserver""MysqLd"
if!MysqLd_statuscheck_deadNowarn;then
set+e
shutdown_out=`$MYADMINshutdown2>&1`;r=$?
set-e
if["$r"-ne0];then
log_end_msg1
["$VERBOSE"!="no"]&&log_failure_msg"Error:$shutdown_out"
log_daemon_msg"KillingMysqLdatabaseserverbysignal""MysqLd"
killall-15MysqLd
server_down=
foriin12345678910;do
sleep1
ifMysqLd_statuscheck_deadNowarn;thenserver_down=1;break;fi
done
iftest-z"$server_down";thenkillall-9MysqLd;fi
fi
fi
if!MysqLd_statuscheck_deadwarn;then
log_end_msg1
log_failure_msg"PleasestopMysqLmanuallyandread/usr/share/doc/MysqL-server-5.5/README.Debian.gz!"
exit-1
else
log_end_msg0
fi
;;
'restart')
set+e;$SELFstop;set-e
$SELFstart
;;
'reload'|'force-reload')
log_daemon_msg"ReloadingMysqLdatabaseserver""MysqLd"
$MYADMINreload
log_end_msg0
;;
'status')
ifMysqLd_statuscheck_aliveNowarn;then
log_action_msg"$($MYADMINversion)"
else
log_action_msg"MysqLisstopped."
exit3
fi
;;
*)
echo"Usage:$SELFstart|stop|restart|reload|force-reload|status"
exit1
;;
esac